| Popis: |
Biodenitrification of nitrite and nitrate/nitrite mixtures was studied with a pure culture of Pseudomonas denitrificans (ATCC 13867), which is a strict anaerobe. The study involved theoretical analysis, and experimental verification of the biodenitrification process when a reactor operating in a periodic mode is employed. This reactor operates continuously in a cyclic mode, and each one of its cycles is made-up of three phases. During the first phase, the stream to be processed is fed to the reactor; reaction is initiated while the volume of the liquid hold-up of the reactor increases. During the second phase, reaction proceeds in the batch mode. During the third phase, part of the reactor contents are drawn-down till the volume of the reactor liquid hold-up returns to the value it had in the beginning of the cycle. At that point, the cycle starts repeating itself. A complete mathematical analysis of nitrite bioreduction is presented along with results from experiments performed with a 2 l reactor. Experimental results involve denitrification of water media containing either nitrite only, or mixtures of nitrate and nitrite. Theoretical predictions and experimental data are in excellent agreement. |
